Hi, having tried out bcp in WinXp I was fooled for some time by not entering the correct boost path at the command line, when the app silently fails. Therefore I wonder if testing for invalid boot path would improve things. Something like the following patch in cpp_main in file main.cpp seems to work: cpp_main(int argc, char* argv[]) .... else if(0 == std::strncmp("--boost=", argv[i], 8)) { const char* boost_path = argv[i] + 8; if(boost::filesystem::exists(boost_path)){ papp->set_boost_path(boost_path); } else{ std::string msg("ERROR boost path : "); msg += boost_path msg += " is invalid\n"; throw std::runtime_error(msg); return 0; } } ... } regards Andy Little